If it is a proof coin is should either be in its original holder or should have been broken out and re-slabbed to protect it. If so, it's worth about 50 cents.
If it's not in any kind of protective packaging, its value as a proof coin has been reduced to essentially nothing, I'm afraid.
Unless it's a proof coin, 1¢ Note that this site has a Coins and Currency thread for asking questions about, well, coins and currency. Money and Credit is for things like checks, credit cards, loans, etc.
In good condition-$1.50, in fine condition-$2.50, in uncirculated condition-$35.00, proof-$150.00.
An 1896 Indian Head Penny in good condition is worth $1.35, in fine condition is worth $2.00, in uncirculated condition is worth $30.00, proof is worth $150.00.
1869 Indian Head Penny: In good condition is worth $45.00, In fine condition is worth $175.00, uncirculated is worth $400.00, proof is worth $550.00.
Proof pennies are only made at San Francisco. It's not a proof. It is just a penny worth a penny.
About $2.00 for average proof coins
These coins are no longer in circulation since Irelands changeover to the Euro in 2002. Unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they have little or no value.
A 1976 penny, specifically a Lincoln Memorial penny, is typically worth only its face value of one cent if it's in circulated condition. However, if it's uncirculated or in excellent condition, it could be worth a few cents to a dollar. Special varieties, like the 1976-S proof penny, can be worth more to collectors. Overall, the value largely depends on the coin's condition and any unique characteristics it may have.
Unless it's brilliant uncirculated or proof, face value.
Roughly 5 dollars depending on the condition.
1980-S pennies were only issued in proof sets. At a minimum, they are worth about 75 cents. The highest grade proof condition pennies are worth $4.00 and up.
The decimal New Half Penny and Half Penny coins were last issued for circulation in 1983 and were withdrawn from circulation and demonetised in December 1984. So, unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they have little or no value. The 1984 Half Penny was only issued as part of a Royal Mint Uncirculated or Proof set. A British 1984 bronze Half Penny coin (Elizabeth II), uncirculated and in absolute mint condition could fetch up to £2 GBP. A British 1984 bronze Half Penny coin (Elizabeth II)(Proof), uncirculated and in absolute mint condition could fetch up to £2 GBP. A reputable coin dealer will be able to give a more accurate valuation.